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Title: Annular gap (cylindrical body) electro-magnet No [Go to resource]
Description: Annular gap (cylindrical body) electro-magnet No. 3, assembled with polar gap approximately 19/16" to 1 1/4" License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1926-711 Go to resource More Like this...-
Complete Grigg's electro-magnetic therapy machine,…Complete Grigg's electro-magnetic therapy machine,…
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